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Exploring cosmic origins with CORE: Mitigation of systematic effects

Natoli, P; Ashdown, M; Banerji, R; Borrill, J; Buzzelli, A; de Gasperis, G; Delabrouille, J; ... Zannoni, M; + view all (2018) Exploring cosmic origins with CORE: Mitigation of systematic effects. Journal of Cosmology and Astroparticle Physics , 2018 (4) , Article 022. 10.1088/1475-7516/2018/04/022. Green open access

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Abstract

We present an analysis of the main systematic effects that could impact the measurement of CMB polarization with the proposed CORE space mission. We employ timeline-to-map simulations to verify that the CORE instrumental set-up and scanning strategy allow us to measure sky polarization to a level of accuracy adequate to the mission science goals. We also show how the CORE observations can be processed to mitigate the level of contamination by potentially worrying systematics, including intensity-to-polarization leakage due to bandpass mismatch, asymmetric main beams, pointing errors and correlated noise. We use analysis techniques that are well validated on data from current missions such as Planck to demonstrate how the residual contamination of the measurements by these effects can be brought to a level low enough not to hamper the scientific capability of the mission, nor significantly increase the overall error budget. We also present a prototype of the CORE photometric calibration pipeline, based on that used for Planck, and discuss its robustness to systematics, showing how CORE can achieve its calibration requirements. While a fine-grained assessment of the impact of systematics requires a level of knowledge of the system that can only be achieved in a future study phase, the analysis presented here strongly suggests that the main areas of concern for the CORE mission can be addressed using existing knowledge, techniques and algorithms.

Type: Article
Title: Exploring cosmic origins with CORE: Mitigation of systematic effects
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1475-7516/2018/04/022
Publisher version: http://dx.doi.org/10.1088/1475-7516/2018/04/022
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, CMBR experiments, CMBR polarisation, gravitational waves and CMBR polarization, MAP-MAKING ALGORITHM, POLARIZATION MAPS, PLANCK SURVEYOR, CMB EXPERIMENTS, INSTRUMENT, NOISE, LIKELIHOOD, SPECTRA, FLIGHT
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10056186
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